Combustion stratification combustion process for a direct-injection, spark-ignition internal combustion engine

摘要

For a combustion process with charge stratification for a direct-injection, externally ignited internal combustion engine, in which, in stratified charge operation, charge air via one of two flow-optimized, valve-controlled inlet channels into a cylinder of the internal combustion engine with a cylinder-like roof-like inlet valve and at least one outlet valve containing boundary and a piston with one roof adapted piston crown with a trough oriented on the inlet side is introduced to form a predominant swirl flow, fuel being introduced into the swirl flow from an injection nozzle. In order to avoid the piston trough as an essential device for the formation of an ignitable mixture cloud in stratified charge operation, it is proposed that a high charge of air to form a strong swirl flow with a compact swirl core is achieved via a flow-optimized filling channel, the swirl core being at the latest in the 2nd stroke section of the Piston against TDC is held in a fixed position in such a way that fuel introduced into the swirl core at a relatively late end of injection in the swirl core is essentially supplied to an ignition device for initiating combustion by the piston movement against TDC.